Plant stemflow velocity measuring method and device thereof

Abstract

The invention relates to a plant stemflow flow rate measurement method and the device for measuring the stemflow flow rate of a plant minute stem or a herbal plant by using the heat-pulse tracing technology; a heater is arranged on the plant stem the stemflow rate of which needs to be measured; the upper and lower parts of the plant stem which are away from the heater with the equal distance S are respectively provided with a pair of temperature sensors, and the two sensors of each pair of temperature sensors are separately arranged along the up and down direction of the stem for detecting temperature differences; the heater is started to carry out an instant heating to the stem, at the same time, the heater is cleared to zero and two timers are started; when the upper and lower pairs of temperature sensors respectively detect the temperature differences, the corresponding timer is closed, and the recording times of the two timers and the S are substituted into a formula to get the stemflow flow rate, thus effectively reducing the heating amount of the stem; the invention is not only applicable to common fruit bearing forest and other woody plants, but also expands the heat-pulse tracing technology to the stemflow rate measurement of plant minute stem or herbal plant, and the invention has the advantages of stable work, economy, practicability, safety, reliability and high accuracy.

Description

Technical field: [0001] The invention relates to a method and a device for measuring the stalk flow velocity of a plant, in particular to a method and a device for measuring the stalk flow velocity of a plant using a heat pulse tracing technique to measure the stalk flow velocity of plant stalks or herbaceous plants. Background technique: [0002] Sap flow refers to the ascending sap flow caused by transpiration in the plant. The sap flow is equal to the sap flow velocity multiplied by the cross-sectional area of ​​the plant vessel. After the soil liquid water enters the root system, it is transported upwards to the canopy through the stem transport tissue, and is transformed into gaseous water through stomata transpiration (including stratum corneum and lenticelium) and diffuses into the atmosphere. More than 99.8% of the water absorbed by the roots is consumed by transpiration. The sap flow measurement technology provides an accurate method to directly measure transpiration in ...

AI Technical Summary

Problems solved by technology

Its measurement method and its products have the following deficiencies: First, the method adopted is to calculate the thermal fluctuation velocity by measuring the change of the heat pulse thermal diffusion curve of the measuring point, and then perform a quadratic trinomial or a cubic trinomial on the thermal fluctuation velocity regression and correction to obtain sap flow velocity

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